Closed isolation structure for high-voltage molded case circuit breaker

Abstract

The invention discloses a closed isolation structure for a high-voltage molded case circuit breaker. The closed isolation structure comprises a circuit breaker and isolation hoods arranged on each pole of the circuit breaker, the isolation cover comprises a front isolation cover and a rear isolation cover; the front isolation cover and the rear isolation cover are correspondingly and detachably connected; the front isolation cover is sleeved outside the arc extinguishing chamber; and the rear isolation cover is arranged on the contact structure. According to the circuit breaker, the isolation cover is arranged on the circuit breaker, the isolation cover is assembled in the circuit breaker (a shell), so that an arc extinguishing system and a contact system of the circuit breaker are isolated and protected in the isolation cover, each pole in the circuit breaker is effectively sealed, mutual flowing of airflow can be effectively controlled when the circuit breaker is subjected to a breaking test, and the breaking efficiency of the circuit breaker is improved. The insulation performance of the product is improved; each pole is closed, so that the air pressure in the isolation cover is increased, the movement speed of the arc is increased, the arc is transferred quickly, and the breaking capacity of the product is improved; the method has the advantage that the insulation performance of the product can be improved at low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, in particular to a closed isolation structure for a high-voltage molded case circuit breaker. Background Art

[0002] High-voltage molded case circuit breakers are a type of high-voltage electrical switch, primarily used in high-voltage circuits. Their core functions are controlling circuit on / off, protecting circuit safety, and isolating power supplies. Operating voltages can reach AC 1140V. During normal operation, the circuit breaker connects and disconnects the no-load current and load current in the circuit. In the event of a system fault, the protective device quickly shuts off overload or short-circuit current to ensure safe operation of the power system. Furthermore, when repairing circuits or equipment, the faulty component can be reliably isolated from the power supply, creating a clear disconnection point and ensuring the safety of maintenance personnel.

[0003] When the dielectric performance of existing high-voltage molded case circuit breaker products was verified after sub-testing, it was found that the products did not meet the corresponding standard requirements. Summary of the Invention

[0004] The present invention aims to provide a closed isolation structure for a high voltage molded case circuit breaker. The present invention has the advantage of improving the insulation performance of the product at a low cost.

[0005] The technical solution of the present invention is as follows: a closed isolation structure for a high-voltage molded case circuit breaker, comprising a circuit breaker and an isolation cover detachably mounted on each pole of the circuit breaker; the isolation cover comprises a plurality of front isolation covers arranged at the front end of the circuit breaker and corresponding rear isolation covers arranged at the rear end of the circuit breaker; the front isolation covers are correspondingly detachably connected to the rear isolation covers; each of the front isolation covers is correspondingly detachably mounted outside the arc extinguishing chamber of the circuit breaker; and each of the rear isolation covers is correspondingly detachably mounted on the contact structure of the circuit breaker.

[0006] In the aforementioned closed isolation structure for high-voltage molded case circuit breakers, each of the front isolation covers includes a front main cover body, a front secondary cover body with an inclined top, and a front side cover body located outside the two sides of the front secondary cover body and connected to the front main cover body; a front cover groove is provided in the middle of the front isolation cover.

[0007] In the aforementioned closed isolation structure for a high-voltage molded case circuit breaker, the rear isolation cover includes a left rear isolation cover and a right rear isolation cover, which are correspondingly distributed on both sides of the circuit breaker handle; the left rear isolation cover includes a rear cover body, a rear cover side groove opened on the side wall of the rear cover body, and a rear cover plug block provided at the upper end of the rear cover body; the front isolation cover is provided with a card slot corresponding to the rear cover plug block.

[0008] In the aforementioned closed isolation structure for high voltage molded case circuit breaker, a mounting hole for fixing is provided on the lower end portion of the rear cover; and a rear cover groove is provided inside the rear cover.

[0009] In the aforementioned closed isolation structure for high voltage molded case circuit breaker, the right rear isolation cover is similar in structure to the left rear isolation cover, and the right rear isolation cover is symmetrical to the left rear isolation cover.

[0010] Compared with the prior art, the present invention provides an isolation cover consisting of a front isolation cover and a rear isolation cover on the circuit breaker, assembling the isolation cover inside the circuit breaker, that is, installing the isolation cover inside the circuit breaker housing, thereby isolating and protecting the arc extinguishing system and contact system of the circuit breaker in the isolation cover. By effectively sealing each pole inside the circuit breaker, the crosstalk of airflow can be effectively controlled during the circuit breaker breaking test, thereby improving the insulation performance of the product. At the same time, because each pole is enclosed, the air pressure in the isolation cover is increased, the arc movement speed is increased, and the arc is quickly transferred from the contact surface, thereby improving the breaking capacity of the product; The isolation cover has a simple structure and low processing cost, and is easy to promote and apply on a large scale in batches.

[0011] Therefore, the present invention has the advantage of being able to improve the insulation performance of the product at a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a side cutaway view of the present invention; Figure 3 It is a structural diagram of the front isolation cover of the present invention; Figure 4 3. It is a three-view drawing of the front isolation cover of the present invention; Figure 5 It is a structural diagram of the rear isolation cover of the present invention; Figure 6 This is a three-view drawing of the rear isolation cover of the present invention (left); Figure 7 3D is the three-view drawing of the rear isolation cover of the present invention (right).

[0013] The marks in the accompanying drawings are: 1-circuit breaker, 2-front isolation cover, 21-front main cover body, 22-front secondary cover body, 23-front side cover body, 24-front cover slot, 3-rear isolation cover, 31-left rear isolation cover, 32-right rear isolation cover, 33-rear cover body, 34-rear cover side slot, 35-rear cover plug, 36-rear cover slot, 4-connection point, 5-fixing screw. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0015] Example. Enclosed isolation structure for high voltage molded case circuit breaker, such as Figure 1-2 As shown, it includes a circuit breaker 1 and an isolation cover detachably mounted on each pole of the circuit breaker 1, characterized in that: the isolation cover includes a plurality of front isolation covers 2 arranged at the front end of the circuit breaker 1 and rear isolation covers 3 correspondingly arranged at the rear end of the circuit breaker 1; the front isolation covers 2 and the rear isolation covers 3 are correspondingly detachably connected; each of the front isolation covers 2 is correspondingly detachably mounted outside the arc extinguishing chamber of the circuit breaker 1; and each of the rear isolation covers 3 is correspondingly detachably mounted on the contact structure of the circuit breaker 1.

[0016] The front isolation cover 2 and the rear isolation cover 3 are correspondingly mounted and connected at the connection point 4 ; the rear isolation cover 3 is connected to the thermal element of the circuit breaker 1 via fixing screws 5 .

[0017] like Figure 3 and 4 As shown, each of the front isolation covers 2 includes a front main cover body 21, a front secondary cover body 22 with an inclined top, and a front side cover body 23 located outside the front secondary cover body 22 and connected to the front main cover body 21; a front cover groove 24 is opened in the middle of the front isolation cover 2.

[0018] like Figure 5-7 As shown, the rear isolation cover 3 includes a left rear isolation cover 31 and a right rear isolation cover 32, which are correspondingly distributed on both sides of the handle of the circuit breaker 1; the left rear isolation cover 31 includes a rear cover body 33, a rear cover side groove 34 opened on the side wall of the rear cover body 33, and a rear cover plug block 35 provided at the upper end of the rear cover body 33; the front isolation cover 2 is provided with a card slot corresponding to the rear cover plug block 35.

[0019] A mounting hole for fixing is defined on the lower end of the rear cover 33 , through which the fixing screw 5 passes; and a rear cover groove 36 is defined inside the rear cover 33 .

[0020] The right rear isolation cover 32 is similar in structure to the left rear isolation cover 31 , and the right rear isolation cover 32 is symmetrical to the left rear isolation cover 31 .

Claims

1. A closed isolation structure for a high voltage molded case circuit breaker, comprising a circuit breaker (1) and an isolation cover detachably mounted on each pole of the circuit breaker (1), characterized in that: The isolation cover comprises a plurality of front isolation covers (2) provided at the front end of the circuit breaker (1) and a rear isolation cover (3) provided at the rear end of the circuit breaker (1); the front isolation covers (2) and the rear isolation covers (3) are correspondingly detachably connected; each of the front isolation covers (2) is correspondingly detachably sleeved outside the arc extinguishing chamber of the circuit breaker (1); and each of the rear isolation covers (3) is correspondingly detachably provided on the contact structure of the circuit breaker (1).

2. The closed isolation structure for a high voltage molded case circuit breaker according to claim 1, characterized in that: Each of the front isolation covers (2) comprises a front main cover body (21), a front secondary cover body (22) with an inclined top, and a front side cover body (23) located outside the front secondary cover body (22) on both sides and connected to the front main cover body (21); a front cover groove (24) is provided in the middle of the front isolation cover (2).

3. The closed isolation structure for a high voltage molded case circuit breaker according to claim 1, characterized in that: The rear isolation cover (3) includes a left rear isolation cover (31) and a right rear isolation cover (32), and the left rear isolation cover (31) and the right rear isolation cover (32) are correspondingly distributed on both sides of the handle of the circuit breaker (1); the left rear isolation cover (31) includes a rear cover body (33), a rear cover side groove (34) provided on the side wall of the rear cover body (33), and a rear cover plug block (35) provided on the upper end of the rear cover body (33); and the front isolation cover (2) is provided with a card slot corresponding to the rear cover plug block (35).

4. The closed isolation structure for a high voltage molded case circuit breaker according to claim 3, characterized in that: A mounting hole for fixing is provided on the lower end of the rear cover body (33); and a rear cover groove (36) is provided inside the rear cover body (33).

5. The closed isolation structure for a high voltage molded case circuit breaker according to claim 4, characterized in that: The right rear isolation cover (32) is similar in structure to the left rear isolation cover (31), and the right rear isolation cover (32) and the left rear isolation cover (31) are symmetrical.

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